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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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48
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11 ngx_buf_t *
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12 ngx_create_temp_buf(ngx_pool_t *pool, size_t size)
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0
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13 {
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14 ngx_buf_t *b;
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15
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50
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16 b = ngx_calloc_buf(pool);
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17 if (b == NULL) {
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0
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18 return NULL;
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19 }
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20
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50
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21 b->start = ngx_palloc(pool, size);
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22 if (b->start == NULL) {
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0
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23 return NULL;
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24 }
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25
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48
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26 /*
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27 * set by ngx_calloc_buf():
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28 *
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29 * b->file_pos = 0;
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30 * b->file_last = 0;
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31 * b->file = NULL;
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32 * b->shadow = NULL;
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33 * b->tag = 0;
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34 *
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35 */
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36
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0
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37 b->pos = b->start;
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38 b->last = b->start;
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39 b->end = b->last + size;
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40 b->temporary = 1;
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41
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42 return b;
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43 }
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44
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45
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48
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46 ngx_chain_t *
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56
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47 ngx_alloc_chain_link(ngx_pool_t *pool)
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48 {
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49 ngx_chain_t *cl;
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50
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51 cl = pool->chain;
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52
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53 if (cl) {
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54 pool->chain = cl->next;
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55 return cl;
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56 }
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57
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58 cl = ngx_palloc(pool, sizeof(ngx_chain_t));
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59 if (cl == NULL) {
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60 return NULL;
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61 }
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62
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63 return cl;
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64 }
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65
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66
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67 ngx_chain_t *
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48
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68 ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs)
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0
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69 {
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70 u_char *p;
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71 ngx_int_t i;
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72 ngx_buf_t *b;
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73 ngx_chain_t *chain, *cl, **ll;
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74
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50
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75 p = ngx_palloc(pool, bufs->num * bufs->size);
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76 if (p == NULL) {
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0
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77 return NULL;
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78 }
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79
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80 ll = &chain;
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81
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82 for (i = 0; i < bufs->num; i++) {
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50
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83
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84 b = ngx_calloc_buf(pool);
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85 if (b == NULL) {
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0
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86 return NULL;
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87 }
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88
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48
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89 /*
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90 * set by ngx_calloc_buf():
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91 *
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92 * b->file_pos = 0;
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93 * b->file_last = 0;
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94 * b->file = NULL;
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95 * b->shadow = NULL;
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96 * b->tag = 0;
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97 *
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98 */
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99
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0
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100 b->pos = p;
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101 b->last = p;
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102 b->temporary = 1;
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103
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104 b->start = p;
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105 p += bufs->size;
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106 b->end = p;
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107
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50
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108 cl = ngx_alloc_chain_link(pool);
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109 if (cl == NULL) {
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0
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110 return NULL;
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111 }
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112
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113 cl->buf = b;
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114 *ll = cl;
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115 ll = &cl->next;
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116 }
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117
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118 *ll = NULL;
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119
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120 return chain;
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121 }
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122
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123
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48
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124 ngx_int_t
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125 ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in)
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0
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126 {
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127 ngx_chain_t *cl, **ll;
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128
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129 ll = chain;
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130
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131 for (cl = *chain; cl; cl = cl->next) {
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132 ll = &cl->next;
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133 }
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134
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135 while (in) {
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50
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136 cl = ngx_alloc_chain_link(pool);
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137 if (cl == NULL) {
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138 return NGX_ERROR;
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139 }
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0
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140
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141 cl->buf = in->buf;
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142 *ll = cl;
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143 ll = &cl->next;
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144 in = in->next;
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145 }
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146
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147 *ll = NULL;
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148
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149 return NGX_OK;
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150 }
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151
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152
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48
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153 void
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154 ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
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155 ngx_chain_t **out, ngx_buf_tag_t tag)
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0
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156 {
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48
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157 ngx_chain_t *cl;
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0
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158
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159 if (*busy == NULL) {
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160 *busy = *out;
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161
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162 } else {
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48
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163 for (cl = *busy; cl->next; cl = cl->next) { /* void */ }
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4
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164
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48
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165 cl->next = *out;
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0
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166 }
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167
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168 *out = NULL;
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169
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170 while (*busy) {
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171 if (ngx_buf_size((*busy)->buf) != 0) {
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172 break;
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173 }
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174
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18
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175 #if (NGX_HAVE_WRITE_ZEROCOPY)
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0
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176 if ((*busy)->buf->zerocopy_busy) {
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177 break;
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178 }
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179 #endif
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180
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181 if ((*busy)->buf->tag != tag) {
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182 *busy = (*busy)->next;
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183 continue;
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184 }
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185
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2
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186 (*busy)->buf->pos = (*busy)->buf->start;
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187 (*busy)->buf->last = (*busy)->buf->start;
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0
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188
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48
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189 cl = *busy;
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190 *busy = cl->next;
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191 cl->next = *free;
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192 *free = cl;
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0
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193 }
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194 }
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